Ein definitions

A chemical compound related to a specified compound with a similar name ending in –in or –ine:

Phthalein.

suffix
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Used to differentiate a compound from another having a similar spelling but ending in -in or -ine.
affix
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Used to indicate a compound containing an internal anhydride.
affix
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(US, taxation) Employer Identification Number.
initialism
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Origin of ein

altered < -in & -ine